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STR-414L
STR-414L
FM DISCRIMINATOR ALIGNMENT 1
Procedure:
1. Detune the set.
2. Turn
the core (primary
side) of IFT201
for null-
point reading on the FM TUNING meter.
Ways
FM
\|TUNING
Null-point reading
1FT201
(primary side: blue)
'FTI
RT203
FM IF ALIGNMENT
FM rf
signal
generator
FM ANT
REC OUT1
MPX ADJUSTMENT
A) Regular Method
Procedure:
FM rf signal
generator
Carrier frequency:
98 MHz
Modulation:
no modulation
Output level:
ImV
(60d8)
t
a cores counter
test point
R239
1. Tune the set to 98 MHz.
2. Adjust RT203 for 76 kHz +100Hz on the counter.
FM
Signal Generator
Setting:
Carrier frequency:
98 MHz
Modulation:
400 Hz, 75 kHz deviation
(100% }
Output level:
12uV (21.5d8)
Procedure:
Tune
the
set
to
98
MHz
and
adjust
IFT!
for
a maximum réading on the VITVM.
B) Simple Method
Procedure:
1. Tune the set to the FM stereo broadcasting signal.
2. Turn
RT203
clockwise
or counterclockwise
and
memorize the lighting-up range of STEREO lamp.
3. Secure RT203
at the center in lighting-up range of
both turns as shown below.
center in lighting-up
ranges
lighting-up
range
—14—
@
IC Block Diagrams
C201
CX168
aa
oe
FM
IF
FM LEVEL
AMP
OET
VOLTAGE
REGULATOR
r—|FM DET
FM/AM
SWITCHING
FM
| LIMITER
AM MUTING/
METER ORIVE
oe]
AM AGC
1C401, 451
HAI457
C501, 551 CXI7I
B+
|
[TIME
I
CONSTANT
TIME
|. A
CONSTANT
—15—
C202
CXI78
2
OIVIDER
LAMP
DRIVER
1/2
DIVIDER
| STR-41 4L
SWITCHING
PREAMP
1C601
HAI2002
SWITCHING|
OC DET
THERMAL DET]
B-
REGULATOR
~ fe
BUFFER
.
AMP
STEREO
SWITCHING
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